uboot修改传递给内核的cmdline的方法

uboot修改传递给内核的cmdline的方法：

1.setenv bootargs

   /*将数组转化为字符串*/
   printf("setenv ipaddr!\n");
   ip4s_to_string(ip_addr_local,ip_addr_local_str);
   puts(ip_addr_local_str);
   printf("\n");
   /*设置ipaddr*/
   //env_set("ipaddr",ip_addr_local_str);

   strcpy(str,"setenv ipaddr ");
   strcat(str,ip_addr_local_str);
result = run_command(str,0);

2.如何uboot使用了设备树，可以解析设备树中的bootargs节点，并对其进行编辑。

#include <common.h>
#include <libfdt.h>
#include <version_autogenerated.h>

extern unsigned int xilinx_ID;

#ifdef CONFIG_OF_BOARD_SETUP
int ft_board_setup(void *blob, bd_t *bd)
{
   int nodeoffset;
   void *fdt = blob;
   /* just for test! When use, we set the addstr to be what we want */
   /* we must begin addstr with ' '! */
   char addstr[64]=" BOOT_VERSION=";
char addstr1[64]=" XILINX_ID=";
   int err;
   char *str; /* used to set string properties */

   strcat(addstr,U_BOOT_VERSION);
sprintf (str, "%d",xilinx_ID);
   strcat(addstr1,str);
   strcat(addstr,addstr1);
   printf("ft_board_setup: %s\n",addstr);

   err = fdt_check_header(fdt);
   if (err < 0) {
   printf("fdt_chosen: %s\n", fdt_strerror(err));
   return err;
   }

/* find or create "/chosen" node. */
nodeoffset = fdt_find_or_add_subnode(fdt, 0, "chosen");
if (nodeoffset < 0)
   {
       printf("ft_board_setup fdt_find_or_add_subnode <0\n");
       return nodeoffset;
   }

   //printf(" addstr = %s len=%d\n",addstr,strlen(addstr));
err = fdt_appendprop(fdt, nodeoffset, "bootargs", addstr,
strlen(addstr) + 1);
if (err < 0) {
printf("WARNING: could not set bootargs %s.\n",
fdt_strerror(err));
       return err;
   }

return 0;
}
#endif

原文链接：https://blog.csdn.net/u014426028/article/details/110931584